Selective switch



O. H. KOPP sELEcTrvE SWITCH Filed Sept. 9, 1920 150 /H venan/ U/ma/f Kopp oo no Aug. 7, 1923.

Patented Aug. 7, 19723.

f i' 1,464,018 UNlTED sra kas @PATENT OFFICE.;

OTTMAR H. KOPP, or "BROOKLYN, `NEW YORK, AssIGNoii' 'fro WEs'rERN ELnccraioY COMPANY, INCQRPORATED, OF NEW YORK, N. Y., ACQRPORATION OFI NEW YORK.

snLnorIvE SWITCH. Y

Application filed September-9, 1920.` Serial No. 409,130.

if To ill whom t may concern:

, Be it known that I, OTTMAR H.. Korn, a

citizen` of the United States, residing at;

Brooklyn, in the countyof Kings, State of N ew York, have invented certainA new and useful Improvements in Selective Switches, of which the following isa full,.clear, conf,

cise. and exact description;

This invention relates to selective switches and particularly to switches of the types Vemployed in automatic and semiautomatic telephone exchange systems.

. SelectivelyV operated switches are usedforl a variety of purposes in telephone systems,

ariangzjedft'or the extension of talking con- Y nections by' machine switching apparatus. They are used .to build up .a circuit between subscribers lines over which conversation mavtake place; to registerfdesignations,

' 20 such asthe identifying number of a calling Y ora called line g. to select Amessage registers' and sources of ringing current for partyA lines and to acomplish other desired ends.

AUien employed for the establishment of i conversation v circuits oi for the vregistration of identifying designations, the operation of these switches is generally caused by current impulses resulting either directly or in directly from some act of a subscriber or an' operator. v l

` Infconnection, especially, with switches of the step-by-stepA character, the selective movements of the switch are determined by series of impulses transmitted by means of manually operated sending devices. -If the numberY of` impulses inv each series correctly represents thexcorres'ponding number or character of the designation concerned, the

switches V are the transmission of'impulses whichido not trulyY represent the designation desired and theswitches are consequently;` incorrectly set.- This difficulty isfrequently encountered duc .to thesubscriber disturbing his switch anin a ccurate setting. l

Wit-h the, 'foregoing 'possibility .the 'object of tliisiinvention toeliminate 'response to' transmitted impulses.

accurately positioned. InA 40 practice', however. an `improper manipula tion of the controlling mechanism mavecausej the detrimental effect of accidental impulses on theV operation of selective switches.

A feature of the invention is the provision, in an arrangement where a selective switch is moved 'from position to position fbyfcurrent impulses, of means whereby, if a par-v effective to move saidswit-ch,whi1e the remainingimpu'lsesv of said Aseries cause the movement of the switch through a corre-V sponding number of positions.

These and other features contemplated by i l the present invention will become more ap- -paient from a consideration of the following description.

Iny the drawing, a diagrammatic illustrationis given of a portion of anautomatic telephone system embodyingthe featuresof It will be under-` the present invention. stood, of couise, that the invention in its broadest scope is applicable to any type of multi-position selective switch operated in In the embodiment .taken .for this illustration, however, itis shown as applied toa rotary step'- by-step4 switch `employed vfor registration purposes.

' Referring particularly to the drawing, a. subscribers telephone linelOO is shown terminating in the, brushes 102`and 103.01v an individual line switch. vThe individual line switchfhas accessto trunksleading to districtV selector switches, l one fof vwhich is schematically illustrated by means of brushes '134 yand135 and afewother'ele- The individualswitch and the disments. trict selector switch' maybe' of theftype suitable "for use injthe Well-known power drive panel type switching systems and are of the same general character as the .corresponding switches `shown inV detail-in vthe ypatent vto Stearn and Scudder, No, 1,395,977, issued` November 1,1921. `In the lower' part' of the figure, there is illustrated a portion o1 a register sender upon which the designa-- tions of Wanted lines are registered and which operates in accordance ufith the record received to control the selective movements ofthe switches to establish the connection'. The sender mechanism may likewise be ot the same general nature as that shown and described in detail in the above-mentioned Patent No. 1,395,977, issued November il. 1921.

Each register ot the sender, upon which a designation is recorded, is a step-hy-step single motion rotary switch. Three o1 these registers,- 1110.y 160 and 180 are shown. The register 140 is provided with tour circular banks oli terminals and tour brusheslll, 142, 1113 and 1411 eotn'ierating with their resi'i'eetive banks.` The register 100 is shown with three banks olf terminals with which the brushes 161, 162 and 10? cooperate. Register 180 also has' three banks olf terminals and three corresponding brushes. 181` 182 and 183. The re, .ister switches 1110, and 180 are equipped with magnets 145, 1(31 and 181 `resluectiyely, which serve to ad Vance the brushes in a' stiep-by-step movement'over the terminals. i

The character designates a control switch, the function ot 'whichis to associate the `impulse circuit sruccssirely with the several register switches. The control switch cmuprises tour banks o1 terminals and four brushes 121, 122, 12B' and 121. Magnet 125 operates to more these brushes step-hy-step over their cooperatingteri'nina'ls.

A. brief exivilanation having` been `viren ot the system to which the inrcntion is applied a detailed description will now be made ot its operation.

Assume that the subscriber at substation 100 desires to obtain a telephone connection with another snbscribei"s line in the eX- change. Hc initiates the call in thc usual manner by removingr the receiver Atroni th. switch hook. The individual line switch brushes 102, 10B are thereupon driven to a set of terminals 104i. 105 representing an idle district selector switch. TViren the district selector switch is seized, the sequence switch'110, Whicl controls thesarne, is advanced to a cert..- position in the manner fully explained in the aliovcanentioned Patent No. 1,395,977 issued November 1. 1921.

In this-position, -the lonier contacts 106 and 107 ot sequence sufitcli 110 are closed and the callinff subscribers line is included in series Ywith the i'vindinqs'ot the impulse relay 10S. Relay 10S be" energized and closes a circuit at its arniuiture and front contact for theslo\v-toie1ease relay 109. Relay 10., in turn, closes a circuit tor relay 111. Relay 111 complet-es a' circuit through the Winding ot relay 110, normal position terminal, 136 ot control switch 120,y

Jfrom battery.V

129, armature and bacli Contact. ot' relay 113,

winding ot stepping magnet lil-5 ot the first register switch 1410, conductor 119, winding; ot slow-to-release relay 112 to battery and lground. Relay 112 and magnet' 115 become energized in this circuit. lV hen the line is closed at the tern'iination o1 the lirst i1npulse, relay 10S attracts its armature and opens the almVc-traced circuit. The magnet 14:5 becomes deenergized and advances the brushes 1411, 142, 113 and 1414; Vtroni their normal position to their first' position ter!V initials. VFor each succeeding impulse in the lirst series, relay 10S retracts and attracts its armature and magnet l 5 is operated to advance the brushes of switch 141-0 `one position. Relays 109 and 112 being; slo\rto-rclease maintain their arimttures attracted duringthe brielI interruptions o't their operatingf circuits at the armature and contacts ot' relay 10S.

11s will later be explained the first digit ot wanted designations is always greater than 1. Consequently, the first series corr tarins more than one impulse and the brushes ot' switch 110er@ adyanced beyond their Yfirst position termina After a sullixient interval 'tollowiimv the closure t' the line circuit at the terminatimi ot the last injipulse, the sloW-to-release relay 112 becomes dc energized and a circuit is conipleted 'trom ground, through the right hand armature` and contact et said relay, Windingy ot relay 171 brush 183 ot switch 180, terminal 187, brush 163 ot switch 160, terminal '165, brush 1414 olf switch 140 thence over the particular terminal engaced by the brush 111, contact Winding;r ot magnet 145,

and armature and conductor 119. windingr et relay 112 to battery and `ground. Ylelay 1111 energizcs in this circuit, but due to its high resistance sufficient current does not How to operate` either the stepping magnet 1x15 or the rela)Y 112. ARelay 11st coini'iletes a circuit from ground through its armature and contact, normal position terminal 126, brush 122, le' hand armature and contact ot relay 112. contact and armature and winding of steppingr magnet to battery and ground. Magnet 125 becomes energized, attracts its armature, opens its own circuit and again deenergizes. The deenergization ofY magnet llt) ' feo 125 causes the advance of the brushes ofvthe control switch 120 to their first position terminals. As brush 122 disengages terminal 126, the circuit of stepping magnet 125 is opened and consequently thecontrol switch 120 stops infits first position. lThe movement of brush 121 from its normal posiftion terminal 136 opens the circuitof relay "second digit.

116 and this relay becomes deenergized. A

The calling subscriber proceeds to ma-- nipulate Vthe "sender 101 to transmitthe` second seriesoi: impulses according. toA the When the impulse. relay 108 deenergizes on the firstinterruption ol `the "line circuit, a circuitis established vfrom Vground, through its armature and back contact, leit hand armature and Contact of ieture and magnet 164 deenergizes and ad vances brushes 161, 162 and 163- one posi 'tionp lIn a similarvmanner, the 'remaining impulses of the series cause the successive advance of the brushes of switch 160.

l brush is standing, contactand armatuie'and Vhen the f last Y n 1 ceived, relay `108 maintains its armature attracted and relay 112 deenergizes iafter an and back contact of relay 112, .winding of relay 114, brush`183, terminal 185, brush A'163 and the Vparticular terminalen which said winding of magnet 164, conductor 119, Ywinding of relay 112 to battery and ground; Re-` lay 114 becomes energized while` magnet '164 vand relay 112 remain inactive. The attraction of the armature of relay 114, however, is without effect since brush 122 of switch l -from battery,"throughthewinding andany mature andvcontactomagnet 125, contact 120is` no longer in engagement witli'terminal 126. Relay 112 alsogcloses a circuit and lefthand armature of' `relay,112, 'brush "122, terminal 127, conductor 190', brushf162 and the particular terminal on which `said l brush is standing to ground. Magnet 125 interruptslits own circuit and advances ythe Y. brushesA or' the control switch to their second position terminals. lBrush 122m disengaging terminal`127Y opensthe above-traced circuit yfor magnet-125.

''PulSG-'Sfnder 101'to send they third series of? impulses and relay 108 lretracts'and Aattracts l its armature foreach Yinterruption of'the The calling subscriber operates the 'im` line. For each deenergiz'ation of relay'108, a circuitlis' closed Jfrom ground, through the` armature and backl contactV of said relay,fMag`net*184 interruptsits own circuit'and left hand arma-ture and contact of relay 111,

conductor 117, brush 123, terminal' 131, windrelay impulse has Ijbeen 1 reyvsiftatei's.

ofrrelay *winding and armature andccontact of maging of magnet 184, conductor 119, winding of relay. 112 vto battery andground.y Relay 184xoperates to` adv-ance the brushes 181,

'182 and 188 in a step-by-step motion over their terminal banks. At vthe end oi' this series-oi impulses,- relay 112 releases its armatures and Aa circuit is completed irom 'batt'eiy,tlirough the'a winding and armaground. Magnet 125 operates in this circuit to'advance the brushes of thecontrol switch to their third position terminals. Brush 122 v on disengaging terminal 128iopens Vthe'operating circuit of magnet 125.. VRelay 112,V aty its right hand armature also closes a circuit, as has been explained, inseries with itself and the windings of magnet` 184 and 114.` The energization. of relay 114 is without effect and relay 112 and magnet 184 remaininactive due to the high resist ance in series with their windings. In the lmanner above described, the calling subscriber may continue to 'transmit series of impulses to set as many succeeding register switches as the capacity of the system neces- The impulse.v Vcircuit controlledv at the armature and back contact of relay 108 is successively extended to the lstepping mag- "intervaL A circuit is nowcompleted frlom-A grouni'i,through the right hand armature netsfof theregister switches, throughthe brush 123 of thecontrolswit'ch 120. Thev control switch may be vadvanced from posi. tion to position by circuits Vclosed as described through the brush'122. A

When the complete gdesignation has been registered," a sender-sequenceswitch 150 is started in operation'to associate the registers in succession with a controlling mechanism, such as a set of counting relays. The :banks of terminals over vwhich the brushes 141, 161 and 181 move, may be wired in any suitable manner to the counting relays whereby the particular positionsra'ssumel bythe register switches determinethe movement of the seiective switches in establishing the connecf `tion.--After all thecontrolling functions have i is concerned more particularly 'with the setting of the register switches.

, Th'e"`closure of contact118 completes a circuit from battery,"t`hrough thewinding 112, conductor 119, through the net H184,' brush 183, Contact 118, -to ground.

advances thefbrusheso switch 180 to their reaches normal, the circuit of magnet 184 is opened and a circuit now completed by way ot conductor 119, winding', armature and contact of magnet 164, brush 163, terminal 185, brushl 183, contact 118 to ground. h/lagnet 164 restores the brushes of switch 160. Brush 163 on reaching` its normal position opens the circuit o'lt magnet 164 and closes a circuit by way ot conductor 119,

winding and armature and contact of mag-y to advance the brushes of the control switch 120 to their normal positions.

Thus :tar only the regular operation ot the system has been considered. The calling subscriber has initiated the call and correctly manipulated the apparatus at his disposal lor causing the settingY ot'` the reg ister switches in the exchange. eration will next be given the arrangniment provided by this invention 'for obviating the detrimental efect of accidental preliminaryr impulses.

It frequently occurs that the subscriber inadvertently disturbs his switch hook atter the call has been initiated and prior to the transmission oit' the first series ol impulses. A momentary actuation o't the switch hook opens the line circuit and causes theV deenerization and reenergization ot relay 108. Consequently, a. single impulse is transmitted over brush 128, terminal 129, arma-- ture and back Contact oit relay 113, winding; ot magnet 145, conductor 119, winding of 1 relay 112 to battery and ground. Magnet 145 steps the brushes of the register switch 140 to their lirst positions. At the venld oit' the necessary interval, iiollowin'gthe, transmission oit the accidental impulse, relay `112 deenergizes. A circuit is now closed from ground, through the right hand armature and contact ot relay 112, brush 142, terminal 146, lett hand winding ot relay 113 to hattery and ground. Relay 113. becomes energized in this circuit. It will be noted that the circuit hereinbelore traced tor energizing relay 114, at the end ot a series of impulses now extends from ground. through the rightl hand armature and Contact ot relay 112, winding of relay 114, brnsh183, terminal 185, brush 163, terminal 165, brush 144, terminal 148 to the armature of relay A consid 116. The relay 116, however, is energized and. its arn'iature is attracted to maintain the circuit of relay114 open. rlhere'tore the control switch 120 does not advance 'from' its normal position in response to the deener'- gization oit relay r112 following the preliminary impulse.

lVhen the calling subscriber operates his sender 101 for the first digit, relay 108 responds to each impulseof the series. On the lirst deenergization of relay 108, a circuit .is completed from ground, through the ar mature and` back contact ot said relay, left hand armature and back contact ot relay 111, conductor 117, brush 123, terminal 129. armature and front contact and right hand winding ot' relay 113, conductor 110 winding of relay 112 to battery and ground. llelay 112Vbecomes energized and opens the circuit through the left hand winding ot relay 113. Relay 113, however, remains operated by means of thecircu'it, through its right hand winding and the windingT o1 relay 112. At the end of the first impulse. relay 108 attracts its armatui and opens the circuit through the right handwindina of relay 113 and the winding ot' relay 112. Relay '112 by reason ot' its slow-to-release character maintains its armatures attracted while relay;113becomes deenerrized. l-lenee, the lirstimpulse ofthe series, ollowing the preliminary impulse, does not succeed in reaching thestepping'magnet145 and there-- fore the registerswitch 14.0 remains in its first position. The relay 11S now being deenergfized each of thev followingl impulses of the series are directed to the magnet 145 and switch 140 is driven forward from position to position inA response to each ot suchI impulses. From this point on the operation involved inf `the setting of the succeeding switches is identical wi 1th that already friren.

By thisy arrangement, the first position of. the register switch 140 is reserved to take care of preliminary impulses. For this reason, it is necessary to avoid the use of the ordinal 1v or any other character iiivoilvirnr;- the transmission ot a single impulse, as the first digitof the designa-tion. It will be apparent that by reserving,r the first two or more positions ot switeh140 for that purpose and by making;r the necessary circuit `modiication'any desired number of preliminary impulses/may betalien care of andv an equal number of .impulses erased from' the regular series following such preliminary impulses. Accordingly the first register switch always takes a position which corresponds exactly to the number of impulses containedv in the regular series intended to set such switch ref riardless ot whether or, not the regular series is preceded by preliminary impulses.

What isclaimed is: y

1. 1n combination, a switch having a plurality of settings, means for transmitting current impulses, means operated in response tothe transmission of an impulse to move Y said switchV to its irst setting, and means responsive ,to a succeedingseries of impulses for continuing the movement of said switch ing series of impulses for continuing the.

movement of said switch to a position from normal corresponding to the number ofimliiulses contained in said series'. y

In combination, a switch having a plu- Y rality of positions, means ortransmitting current impulses, means responsive to a single impulse ior, moving said switch Vtoits iii'st position, and means responsive to'a s ucceeding series oi limpulses forcontinuing the movement of said switch toga position corresponding to the numbe'roi' in said succeeding series.V y

4:. In combination, astep-by-stepV switch *i having a plurality of positions, means for transmitting cuirent impulses, means responsive to an impulse ioiv stepping said switch to a position correspondingV to said impulse, and means responsive to a' succeed- W ing series of impulses for continuing the stepping movement 'of said switch to a position corresponding to the number oi inipulses in said succeeding series.

5. In combination, a switch having a plurality oi positions, an impulsercircuit and means for sending' impulses over said circuit, means responsive to a single impulse in said circuit for moving said switch to yits vfirst position, a relay and means for operating the same when the switch is moved to saidl posif tion, and means controlled by said'relay for continuing Vthe movement of said switch in response toa succeeding series lof impulses to a position corresponding to the number of impulses in said series. f

6. In combinatioma vsubscribers line, a

impulses switchhaving a plurality of positions, means for associating said switch with the subvscribers line', means i'or sending impulses over the subscribers line, means responsive to a single impulse for moving said switch to its irst position, and means responsive to a succeeding series of impulses for continuing the movement of said switch toa position corresponding vto the number of impulses eontained in said succeeding series.

7. In combination, a switch having a plurality of positie-ns, means for sending current impulses, means responsive to a particular impulse for movingsaid switch to a position corresponding to said' impulse, and means operable when a succeeding series of impulsesare sent to render ineffective a part or the impulses oi said succeeding series and to move said switch in response to theremaining impulses of vsaid series to a posivtion corresponding to the total' number of impulses in the series. 25. In combination, a switch having a pluiaiity off settings, means for sending current impulses, means responsive vto aparticular impulse ior giving ysaid switch its iirstsetting, and means operable when a succeeding series of impulses are sent to render inet'- ie-ctive Va part of said succeeding impulses i l series to a position corresponding to the total numberv of impulses in the succeeding series.

In witness whereof, I hereunto subscribe my name this seventh day of' September, AQD. 1920.

-oTTMAn H. Korn 

